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Step * 1 1 of Lemma mul_bounds_1a

.....assertion..... 
1. a : ℕ
2. b : ℕ
⊢ (a * 0) ≤ (a * b)
BY
{ (BackThruLemma `mul_preserves_le` THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
1.  a  :  \mBbbN{}
2.  b  :  \mBbbN{}
\mvdash{}  (a  *  0)  \mleq{}  (a  *  b)


By

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Latex:
(BackThruLemma  `mul\_preserves\_le`  THEN  Auto)

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